切根对乌桕容器苗质量的影响

乌桕Sapium sebiferum (L.) Roxb.]是中国特有的彩叶树种,春秋季叶片颜色红艳夺目,具有极高的园林观赏价值.随着中国"森林四化"工作的推进,乌桕逐渐被林业工作者们重视.本研究对乌桕容器苗开展3种不同比例的切根试验,并对其形态及生理指标进行对比分析.结果 表明:切根可显著促进苗高、地径、地上部分生...

Effect of Root Pruning on Quality of Sapium sebiferum (L.) Roxb. Container Seedlings

Sapium sebiferum (L.) Roxb. is a unique color-leaf tree species in China. Its leaf has a bright red color in spring and autumn, and it has a high ornamental value. With China’s forestry development, Sapium sebiferum has been gradually valued. In this paper, three different ratios of root pruning were carried out on the container seedlings of Sapium sebiferum, and the morphological and physiological indexes were compared. The results show that root pruning could significantly promote the seedling height, ground diameter, above-ground biomass, underground biomass and fibrous root biomass, but there is no significant difference between the root pruning treatments. The root morphology of Sapium sebiferum container seedlings could be greatly improved by root pruning. The ideal method is to prune 1/3 of the main root, with an average number of first-order lateral roots of 4.56, a total length of 484.26 cm, a root surface area of 210.59 cm² and a root volume of 7.62 cm³, the root length with a diameter less than 0.5 mm is 255.91 cm and the root length with a diameter more than 4.5 mm is 21.05 cm. The nutritional content and root activity of the seedlings’ roots change after root pruning. The content of soluble sugar and starch of the pruning of 1/3 main root are the highest, 53.34 mg/g and 138.80 mg/g respectively. The root vigor increases with the root pruning ratio.